Former Channel 4 news presenter Jon Snow has revealed he has secretly been battling a dementia diagnosis for three years and wants to be a voice for those also diagnosed

'Dear girl, how wonderful to see you,' my friend Jon Snow says. 'Have you been here before?' There it is. The dawning realisation that Jon might not know who I am.

Jon Snow is set to share his experience in a Channel 4 documentary

Former Channel 4 news presenter Jon Snow has revealed he has secretly been battling a dementia diagnosis for three years and wants to be a voice for those also diagnosed

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For 50 years, and more than 30 of them spent here at Channel 4 News, Jon Snow's life's work, his vocation, was to get to the truth of every story, to inform us all about how the…

We spoke to Kirsty Lang, who knew Jon for four decades - she was a long time colleague of Jon's here at Channel 4 News and interviewed him for an article in the Daily Mail.

Alzheimer's disease, a physical illness that progressively damages the brain, stands as the most prevalent cause of dementia in the UK

Alzheimer's disease is a progressive, neurodegenerative condition and there is currently no cure, though treatments are available that may help to temporarily alleviate symptoms